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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Earth Sci. | doi: 10.3389/feart.2019.00250

The Effects of Deformation on the Crystallization Kinetics of Basaltic Magmas

 Barbara Tripoli1,  Michael Manga1*, Jerome Mayeux1 and Harold Barnard2
  • 1Department of Earth and Planetary Science, University of California Berkeley, United States
  • 2Advanced Light Source (ALS), United States

Crystals and bubbles nucleate and grow in a magma that experiences a range of temperatures, pressures and strain-rates. We have a good conceptual and sometimes quantitative understanding of how crystallization and bubble nucleation are controlled by decompression and cooling. Here we explore the effect of strain-rate on the crystallization kinetics of magmas. In order to understand the interaction between deformation and crystallization, samples of basalt were deformed during their crystallization. We made measurements at subliquidus conditions (1160°C) and deformed samples in compression at strain-rates varying from 0 to 2x10-4 s-1 for a total strain of 0.31. We simultaneously imaged the samples using X-ray micro-tomography. Under static conditions, there was no crystallization during the 260 minutes experiment. By increasing the strain-rate to 1.0x10-4 s-1, crystallization occurs. However, the crystallization kinetics in our experiment do not depend on the strain-rate. We hypothesize that deformation may have an effect on the parameters that govern the crystallization kinetics of magmas, such as activation energy and diffusion by changing chemical potentials.

Keywords: deformation, Crystallization, X-Ray Microtomography, Activation energy, Chemical potential

Received: 11 Jun 2019; Accepted: 05 Sep 2019.

Copyright: © 2019 Tripoli, Manga, Mayeux and Barnard. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mx. Michael Manga, Department of Earth and Planetary Science, University of California Berkeley, Berkeley, 94709, California, United States, manga@seismo.berkeley.edu